What is the reason for the unevenness of the surface grinder?

Abstract: The surface grinder has a plane grinding disc, which can grind and polish optical glass wafers, timely wafers and silicon wafers. When using a surface grinder, sometimes the grinding is uneven and the surface of the workpiece is concave and convex. This may be due to the uneven grinding disc and complex force, and it is impossible to determine the speed and direction of movement according to the size and height ratio of the surface to be ground. It can be solved by trimming the flatness of the grinding disk and using the convex grinding plate. Let's look at the reasons why the surface grinder is uneven. A brief introduction of surface grinder

Surface grinder is a kind of precision grinding and polishing equipment. The material after grinding and polishing is put on a flat grinding disc for grinding, and the workpiece and the grinding disc rub relatively to achieve the purpose of grinding and polishing. Widely used for single-sided grinding and polishing of LED sapphire substrate, optical glass sheet, timing sheet, silicon wafer, die, light guide plate, optical connector and other materials.

Second, what is the reason for the unevenness of the surface grinder?

The workpiece ground by the surface grinder should be flat. If the workpiece is concave and convex after grinding, the possible reasons are as follows:

1. The millstone is uneven. The important function of grinding machine to grinding disc is to accurately transfer the surface geometry of grinding disc to the workpiece to be ground. If the grinding plane is not an ideal plane, it is difficult to get a high-precision plane on the surface of the ground workpiece.

2. Influenced by complex forces such as dynamic torque, torsional torque and inertia force of motion, the instability of motion in the grinding process is promoted, and the edge of the workpiece is subjected to a large force, which is worn off and concave.

3. The speed and direction of motion are not determined by the size and height ratio of the surface to be studied.

4. It is not placed in the middle of the workpiece, resulting in uneven or uneven stress on the workpiece.

5. If the gap between the workpieces in the control ring is too small, the friction trajectory of each point on the surface of the workpiece on the grinding disk will have different densities, which will affect the flatness of the sealing ring, and sometimes even make the workpiece jack up, resulting in the deviation of the grinding surface and uneven grinding.

Three, the surface grinder grinding uneven how to do?

If the surface grinder is not normal, it should be handled in time to avoid the unqualified workpiece. The general treatment method is as follows:

1. First, check the flatness of the grinding disc. The flatness of grinding disc is the benchmark of grinding and the guarantee of obtaining the plane of precision workpiece. The grinding disc of surface grinder needs regular dressing. There are two methods of dressing: one is to dress the surface with a diamond dressing wheel on the reference plane, and the other is to dress the surface with a dressing mechanism.

2. If the unevenness is affected by complex forces such as dynamic torque, torsional torque and inertia force, the grinding disc with raised surface can be used to compensate, which can not only solve the quality problem caused by uneven wear, but also prolong the service life of the grinding disc.

3. If the gap between the workpieces is too small, just adjust the gap between the workpieces in the control loop.